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Installation Overview For additional details, request Under- <br /> Fiberglas underground tanks must be ground Tank Installations (Owens- <br /> installed in accordance with the instal- Corning publication numbers 3PE-6304 <br /> lation instructions (Ov=ns-Corn -ig and 3PE-12681). <br /> Fiberglas publication .mbers 3'E-6304 Properly installed, Fiberglas under- <br /> and 3PE-12681). Theses documents ground petroleum storage tanks can <br /> should be part of your tank specifica- provide extended service in storing <br /> tions. Some key installation steps are petroleum products without corrosion- <br /> highlighted below. See the published caused leaks and without maintenance. <br /> installation instructions for complete Owens-Corning maintains a network of <br /> details. over 600 independent contractors who <br /> Double-wall tanks are factory shipped are trained to install Fiberglas tanks. On <br /> with a continuous vacuum on the cavity request, we can provide contractor <br /> between the inner and outer tank. This referrals. <br /> seal remains intact until the tank is air <br /> tested by the contractor. The contractor <br /> should release the vacuum on the tank , <br /> cavity just prior to performing the special _ <br /> double-wall tank air testing procedure. <br /> ? <br /> Double-wall tanks must be mechanically <br /> unloaded from the delivery truck using <br /> a backhoe or crane. �,r <br /> The tank is shipped with resilient bumper <br /> pads on each end of the tank. The tank <br /> may be installed with or without the <br /> bumper pads attached. <br /> A special air test procedure is required <br /> for double-wall tanks. A special air test <br /> fixture is shipped with the tank. Fibe <br /> glas tanks must be pressure tested to 5 <br /> psi and inspected for leaks using a soapy <br /> Wai AA <br /> water solution. Pressure testing prior to F ""= <br /> installation helps insure that Fiberglas = �` JrC _ <br /> tanks were not damaged in shipment. <br /> Installation for double wall tanks is <br /> similar to the procedure for single-wall <br /> tanks. Owens-Corning requires pea <br /> gravel backfill material; this gravel is a <br /> naturally rounded aggregate ranging 3 <br /> from " to 3/4" diameter. If ea ravel - <br /> /e P 9 ±, <br /> is not available, washed stone crushings ; <br /> ('ie"to 1/2"diameter)meeting ASTM C-33 ; `�' - f t` <br /> may be used as an alternate. Other 't z <br /> backfill materials must not be used <br /> without consulting Owens-Corning . <br /> Fiberglas for written approval. -. <br /> A minimum of 12" backfill bedding is =- <br /> required between the tank and the <br /> excavation bottom or concrete anchoring <br /> pad. Tanks must not be installed on - <br /> timbers, beams or cradles. <br /> When the Hydrostatic Tank Monitoring <br /> system is used, the tank cavity must be <br /> filled by pouring the liquid into the cavity. <br /> Use tap water or an acceptable anti- <br /> freeze mixture as the monitoring fluid. <br /> All tanks must be vented. Fiberglas <br /> tanks are designed for operation at <br /> atmospheric pressure only, except for <br /> use with vapor recovery systems,provided <br /> the pressure or vacuum does not exceed <br /> 1 psi maximum on the primary tank. If <br /> the monitoring cavity between the inner <br /> and outer tank is vented, it must be <br /> vented independently from the primary <br /> tank. <br /> T�Rr 7- <br />